JP2007185356A - Electric curved endoscope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric curved endoscope by which curbing operation can be continued even though malfunction occurs in a part of the function of a curving operation section. <P>SOLUTION: The logical block of an FPGA 56 is constituted of a serial communication unit 100, a serial communication control unit 101, an EEPROM controller 102, an abnormal signal processing section 103, an LED controller 104, an operation mode controller 105, a DP RAM 106, a clutch signal input section 107, a jig substrate input and output section 108, a RAM 109, a motor controller 110, motor drive waveform generating section 111, an RL (right and left) motor current F/B section 112, a UD (upper and lower) motor current F/B section 113, a potential control section 114, a thermistor control section 115, an RL encoder control section 116, a UD encoder control section 117, an FPGA block abnormality monitoring section 118. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric bending endoscope including an electric bending endoscope in which a bending portion is electrically bent to a state corresponding to an absolute position signal by operating a bending operation instruction unit that outputs an absolute position signal.

  2. Description of the Related Art Recently, an endoscope capable of observing an organ in a body cavity by inserting an elongated insertion portion into a body cavity or performing various therapeutic treatments using a treatment instrument inserted into a treatment instrument channel as necessary. Widely used.

  This endoscope is generally provided with a bending portion that bends up and down / left and right on the distal end side, and the bending portion is bent in a desired direction by pulling and relaxing a bending wire connected to the bending portion. Be made.

  The bending wire is generally operated manually, but recently, as disclosed in, for example, Japanese Patent Application Laid-Open No. 2003-245246, an electric motor that performs a traction operation using a bending power unit such as an electric motor. There is also a curved endoscope.

  In this electric bending endoscope, for example, an electric motor is rotated by a joystick that outputs, for example, a bending instruction signal of an absolute position, which is a bending operation instruction means provided in an operation unit, and a pulley is rotated by rotation of the electric motor. The bending portion was bent by pulling the bending wire connected to the pulley.

The joystick indicates a bending position by tilting. That is, the direction in which the joystick is tilted is the direction in which the bending portion is desired to be bent, and the tilt angle of the joystick is the bending angle of the bending portion. When the tilt angle of the joystick is 0 degree, the bending portion is in a non-curved state (straight state). Therefore, the surgeon can easily grasp the bending state of the bending portion in the body cavity with the sense of a finger holding the joystick.
JP 2003-245246 A

  However, in the conventional electric bending endoscope, a microcomputer (for example, CPU or MPU) is usually used as servo control for controlling the motor of the bending control unit. In this microcomputer, the response speed of the motor is controlled. Although it plays the role of the control unit to control, because the sequential processing is performed in the microcomputer, if some processing functions are stopped, all the functions are stopped, and the bending operation is hindered. There is a problem that the entire inspection becomes complicated.

  The present invention has been made in view of the above-described points, and an object thereof is to provide an electric bending endoscope capable of continuing a bending operation even if a problem occurs in a part of functions of the bending control unit. Yes.

The electric bending endoscope of the present invention is
A bending portion provided in the insertion portion;
A bending drive means having a plurality of constituent members for bending the bending portion;
Bending power means for driving the bending drive means;
Bending state detection means for detecting operation information of the bending drive means and detecting bending state information of the bending portion;
Instruction means for outputting bending instruction information for bending the bending portion;
A bending operation control unit configured by a plurality of independent logic blocks for controlling the bending instruction information of the instruction unit and the bending state information of the bending unit to coincide with each other.

  According to the present invention, there is an effect that the bending operation can be continued even if a problem occurs in a part of the functions of the bending control unit.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 to 24 relate to the first embodiment of the present invention, FIG. 1 is a configuration diagram showing the configuration of the electric bending endoscope apparatus, and FIG. 2 is a diagram showing the configuration of the front panel of the image processing apparatus in FIG. 3 is a diagram showing the configuration of the bending control unit of FIG. 1, FIG. 4 is a diagram showing the configuration of the control unit of the bending control unit of FIG. 1, FIG. 5 is a diagram showing the configuration of the logic block of the FPGA of FIG. Is a diagram showing the configuration of the control processing unit of the motor controller of FIG. 5, FIG. 7 is a diagram showing the configuration of the servo abnormality detection unit of the motor controller of FIG. 5, and FIG. 8 is a diagram illustrating servo control in the motor controller of FIG. FIG. 9 is a second explanatory diagram for explaining servo control in the motor controller of FIG. 5, FIG. 10 is an explanatory diagram for explaining a first modification of servo control in the motor controller of FIG. Is the FPGA configuration in FIG. FIG. 12 is an explanatory diagram for explaining a second modification of servo control in the motor controller of FIG. 5, and FIG. 13 is a logical element constituting the FPGA block abnormality monitoring unit of FIG. FIG. 14 is a second explanatory diagram illustrating a logical element block constituting the FPGA block abnormality monitoring unit of FIG. 5, and FIG. 15 is a logical determination using the logical element block of FIG. FIG. 16 is a second explanatory diagram for explaining a logical decision block using the logical element block of FIG. 13, and FIG. 17 is a logical decision block using the logical element block of FIG. FIG. 18 is a diagram for explaining the process transition in the FPGA of FIG. 5, FIG. 19 is a flowchart for explaining the process in the FPGA of FIG. 5, and FIG. FIG. 21 is a flowchart for explaining the maintenance mode processing of FIG. 19, FIG. 22 is a flowchart for explaining the calibration mode processing of FIG. 19, and FIG. 23 is a flowchart for explaining the operation mode processing of FIG. FIG. 24 is a timing chart for explaining the operation mode processing of FIG.

  As shown in FIG. 1, the electric bending endoscope apparatus 1 of the present embodiment incorporates, for example, an imaging element (not shown) in the distal end rigid portion of an endoscope insertion portion (hereinafter abbreviated as an insertion portion) 9. An electric bending endoscope (hereinafter abbreviated as an endoscope) 2 that bends when the bending portion 11 of the insertion portion 9 electrically pulls a bending wire (described later) that constitutes a bending drive means, and the bending A remote control operation unit (hereinafter abbreviated as a remote control operation unit) 7 as an instruction means for performing a drive operation of the unit 11 and an image processing apparatus 4 for generating an image signal transmitted via the universal cable 12 as a video signal A light source device 3 that supplies illumination light to an illumination optical system (not shown) via a bundle of light guide fibers (not shown) built in the universal cable 12, and a video signal generated by the image processing device 4 is output. A monitor 6 as a display device for displaying an endoscopic image Te, air, is mainly composed of a pump unit 14 for water supply conduit and suction.

  The light source device 3, the image processing device 4, and the pump unit 14 are mounted on a cart 15, and the pump unit 14 is detachably installed with a flow rate control cassette 14a having an air supply, water supply conduit, and suction flow rate adjustment mechanism. Has been. Further, an endoscope fixing arm 13 for holding / fixing the endoscope 2 is provided from the cart 15, and the proximal end holding portion 10 of the endoscope 2 is detachable at the distal end of the endoscope fixing arm 13. Are to be held / fixed.

  A forceps plug 10a to which a suction tube from the flow control cassette 14a can be connected is disposed at the proximal end gripping portion 10 of the endoscope 2, and an air supply / water supply tube from the universal cable 12 and the flow control cassette 14a is provided. Connected. An air supply / water supply tube or the like and a suction tube are connected to an unillustrated air supply conduit, water supply conduit, or suction conduit in the insertion portion 9.

  In addition, a bending control unit 10b for controlling a motor or the like for electrically bending driving the bending unit 11 is built in the proximal end gripping unit 10, and the remote control operation unit 7 is connected to the bending control unit 10b and the cable 7a. It is supposed to be connected via. The remote control operation unit 7 can be connected to the image processing apparatus 4 via the cable 7a, and can be connected to the bending control unit 10b via the universal cable 12.

Although not shown, the remote control operation unit 7 is an operation input device that performs an electric bending operation on the bending unit 11, for example, a joystick, an air supply, water supply, and suction operation input switch, a freeze in the image processing device 4, a release, and the like. It has a scope switch consisting of remote switches. The image processing apparatus 4 serving as the bending state detecting means and the bending operation control means can be connected to the pump unit 14, and the front panel 4 a of the image processing apparatus 4 includes a power switch 20, an electric bending inside, as shown in FIG. An initialization button 23 having an LED function for instructing initialization of the endoscope apparatus 1 and notifying completion of initialization; a calibration LED section 24 for notifying calibration of electric bending of the bending section 11; Operation input switch group 25 for water supply and suction, inspectable LED 26 for informing the state in which inspection by the electric bending endoscope apparatus 1 is possible, and a pipe for displaying the connection state of the air supply line, the water supply line, and the suction line A connection display unit 27 and the like are provided.

  As shown in FIG. 3, the bending wire 33 for up and down for bending the bending portion 11 extending from the bending control portion 10 b and the bending wire for left and right not shown are inserted into the insertion portion 9. Yes. In the following description, the configuration related to the up / down bending wire 33 will be described, and the configuration related to the left / right bending wire, which is the same configuration as the up / down bending wire 33, is not illustrated for the sake of simplicity. Omitted.

  Both ends of the bending wire 33 are connected and fixed to a chain (not shown), for example, and this chain is meshed with a rotatable up and down sprocket portion 34 constituting a bending drive means. For this reason, when the sprocket portion 34 rotates in a predetermined direction, the bending wire 33 fixed to the chain is pulled, and the bending portion 11 is bent in a predetermined direction.

  The sprocket part 34 is disposed, for example, in the bending control part 10b. In this sprocket portion 34, for example, the driving force of the bending motor 30 which is a bending power means for up and down consisting of a three-phase motor, for example, is engaged with a plurality of gears 31 and 32 and the gears which are driving force transmission cutting restoration means such as gears. The clutch mechanism part 36 to attach or detach is provided. Then, by making the bending wire 33 not tensioned by the clutch mechanism portion 36, the bending portion 11 is bent freely by an external force.

  The bending drive means includes gears 31 and 32, a bending wire 33, a sprocket portion 34, a clutch mechanism portion 36, and the like.

  The clutch mechanism 36 moves the switching operation lever 10c (see FIG. 1), which is a state switching means, to a driving force transmission cutting position (hereinafter referred to as a bending-free instruction position) or a driving force transmission restoration position (hereinafter referred to as an angle operation instruction). By switching to the position), the driving force transmission disconnecting state in which the clutch mechanism portion 36 is in a disconnected state and the driving force transmission restoring state in which the clutch mechanism portion 36 is in a connected state are switched.

  In other words, the bending motor 30 and the sprocket part 34 can be reversibly attached and detached by switching the clutch operating part 10c and mechanically switching the clutch mechanism part 36 to a disconnected state or a connected state. ing.

  The amount of rotation of the sprocket portion 34 is detected by a potentiometer 35 which is a bending angle detection means. Reference numeral 30a denotes an encoder that detects the amount of rotation of the bending motor 30. Reference numeral 38 denotes a thermistor that measures the temperature of the bending motor 30. The bending state detection means is constituted by a potentiometer 35 or an encoder 30a.

  The remote control operation unit 7, the encoder 30a, the potentiometer 35, the clutch mechanism unit 36, and the thermistor 38 are connected to the control unit 37 of the bending control unit 10b.

  As shown in FIG. 4, the bending control unit 10b includes a power connector 50 to which a power cable (not shown) via the universal cable 12 is connected and an operation unit connector 51 to which the cable 7a of the remote control operation unit 7 is connected. Is provided. The power connector 50 is connected to the control power supply 52 and the drive power supply 53 in the controller 37. The control power supply unit 52 supplies power for control to each unit via the DC / DC converter 54. In addition, driving power for the three-phase sine wave power generated by the driving power supply unit 53 motor driver 55 is supplied.

  The operation unit connector 51 is connected to an FPGA (field programmable gate array) 56 as a bending operation control means in the bending control unit 10b. The FPGA 56 performs configuration based on data stored in the EEPROM 59, and constructs internal cells into desired logic blocks. The encoder 30 a, the potentiometer 35, the clutch mechanism 36 and the thermistor 38 are connected to the FPGA 56 and controlled by the FPGA 56. The FPGA 56 supplies data for generating the three-phase sine wave power to the motor driver 55, and the motor driver 55 supplies the three-phase sine wave power to the bending motor 30.

  The FPGA 56 outputs a WDT-CR signal that clears a WDT (watchdog timer) 57 when a predetermined abnormality exceeding a certain level occurs in the internal cell. With this WDT-CR, a reset signal is output from the WDT 57 to the FPGA 56, and the FPGA 56 is reset. When the reset signal is input, the FPGA 56 activates the reset IC 58, performs reconfiguration by the EEPROM 59, and reconstructs the logic block of the internal cell.

  As shown in FIG. 5, the logic block of the FPGA 56 includes a serial communication unit 100, a serial communication control unit 101, an EEPROM controller 102, an abnormal signal processing unit 103, an LED controller 104, an operation mode controller 105, a DPRAM 106, and a clutch signal input unit 107. , Jig substrate input / output unit 108, RAM 109, motor controller 110, motor drive waveform generation unit 111, RL (left / right) motor current F / B unit 112, UD (up / down) motor current F / B unit 113, potentiometer control unit 114 Thermistor control unit 115, RL encoder control unit 116, UD encoder control unit 117, and FPGA block abnormality monitoring unit 118. In addition, the motor controller 110 is configured to include logical blocks of a measurement processing unit 200, a control processing unit 201, a servo abnormality detection unit 202, and a servo ON / OFF control unit 203.

  In FIG. 5, the solid line indicates the flow of normal control and data signals, and the broken line indicates the flow of the logic block error signal, servo error signal, or communication error signal.

  The serial communication unit 100 performs serial communication with the remote control operation unit 7 using, for example, LVDS, and the serial communication control unit 101 controls the serial communication unit 100 and communicates with the motor controller 110 to receive data received from the motor controller 110. Is stored in the DPRAM 106.

  The EEPROM controller 102 executes configuration of the FPGA 56 in accordance with a program stored in the EEPROM 59.

  The abnormality signal processing unit 103 monitors the power supply voltage abnormality and overcurrent of the bending motor 30 and outputs the monitoring result to the operation mode controller 105.

  The clutch signal input unit 107 receives a state signal indicating a power transmission disconnection state or a driving force transmission restoration state from the clutch mechanism unit 36 and outputs the state signal to the operation mode controller 105.

  The jig substrate input / output unit 108 transmits / receives data to / from a jig substrate (not shown) for performing debug processing. The LED controller 104 controls the LEDs on the jig substrate.

  The operation mode controller 105 outputs an operation mode corresponding to the power transmission disconnected state or the driving force transmission restored state and the connection state with the jig substrate from the clutch mechanism unit 36 to the motor controller 110. The operation mode controller 105 receives a communication abnormality signal from the serial communication control unit 101 and a servo abnormality signal from the motor controller 110. The operation mode based on these abnormality signals is selected. It outputs to the motor controller 110.

  The motor drive waveform generation unit 111 reads the sine wave data stored in the RAM 109 via the motor controller 110, generates three-phase sine wave data, and sends it to the RL (left / right) motor driver and the UD (up / down) motor driver 55. The three-phase sine wave data is output.

  The RL (left and right) motor current F / B unit 112 converts the U-phase current value and the V-phase current value from the RL (left and right) motor into digital signals and outputs them to the motor controller 110. Similarly, the UD (upper and lower) motor current F / B unit 113 converts the U-phase current value and the V-phase current value from the UD (upper and lower) motor 30 into digital signals and outputs them to the motor controller 110.

  The potentiometer 114 converts the positional information of the potentiometer 35 connected to the RL (left / right) sprocket and UD (up / down) sprocket 34 into a digital signal and outputs the digital signal to the motor controller 110.

  The thermistor control unit 115 converts temperature data measured by the thermistor 38 provided in the RL (left / right) motor and the UD (up / down) motor 30 into a digital signal and outputs the digital signal to the motor controller 110.

  The RL encoder control unit 116 and the UD encoder control unit 117 output the count value of the encoder 30 a provided in the RL (left and right) motor and the UD (up and down) motor 30 to the motor controller 110.

  The motor controller 110 includes a measurement processing unit 200, a control processing unit 201, a servo abnormality detection unit 202, and a servo ON / OFF control unit 203, based on the operation mode. Servo control.

  Further, the FPGA block abnormality monitoring unit 118 receives the logical block abnormality signal, servo abnormality signal, or communication abnormality signal of each of the above logical blocks, and outputs a TRG signal to the motor controller 110 based on these abnormality signals. In addition, the WDT-CR is output to the WDT 57.

  Here, as shown in FIG. 6, the control processing unit 201 of the motor controller 110 includes a position control block 201a, a speed control block 201b, and a torque control block 201c, and the servo abnormality detection unit 202 includes As shown in FIG. 7, a position deviation abnormality determination block 202a, a rotation direction abnormality detection block 202b, an abnormal speed detection block 202c, and an overload abnormality detection block 202d are configured.

  Next, servo control in the motor controller 110 will be described with reference to FIG. The position control block 201a compares the position command value from the remote control operation unit 7 with the output value of the encoder 30a, and if the position deviation exceeds a predetermined value, the position deviation abnormality determination block 202a outputs a servo abnormality signal.

  Further, the speed control block 201b compares the output of the position control block 201a with the differential value of the output value of the encoder 30a (executed by the differential circuit 211). The rotation direction abnormality detection block 202b outputs a servo abnormality signal when it detects an abnormality in the rotation direction based on the output of the position control block 201a and the differential value of the output value of the encoder 30a. The abnormal speed detection block 202c outputs a servo abnormality signal when a speed abnormality is detected based on the differential value of the output value of the encoder 30a.

  Further, the torque control block 201 c compares the output of the speed control block 201 b with the current value of the motor driver 55 and controls the motor driver 55. The overload abnormality detection block 202d monitors the load state of the bending motor 30 based on the output of the speed control block 201b, and outputs a servo abnormality signal when it is determined as an overload state.

  An example of the operation when an abnormality is found in the control loop will be described with reference to FIG. For simplicity, the F / B (feedback) configuration is omitted here.

  For example, the contents when the speed abnormality is met in the speed control block 201b will be described. This shows a case where the position control command value is switched directly to the current control unit (torque control block 201c), and will be described later when the speed control block 201b becomes inoperable as indicated by x in the figure. The position control command value is directly input to the current control by the switching SW (switch unit 210a, switch unit 210b, and switch unit 210c) through the TRG and the signal generated from the abnormality determination unit (indicated by a broken line arrow in the figure) Data flow).

  At this time, since the speed control block 201b is eliminated, the preset loop gain constant is also different. Therefore, the gain setting value without the speed control block 201b (set to a state where no speed control exists in advance). Set again.

  Specifically, when the speed control gain setting value is set to “Sp” (Sp> 0) and the switch SW is switched, the gain setting value when the speed control block 201b does not exist is “1”. It is clear that the closed loop characteristic changes as a result.

  Therefore, by switching the switch unit 210b and the switch unit 210c without switching the other control unit, for example, the switch unit 210a, the amount that the open loop gain is reduced to Sp-> 1, only the speed control block 201b is taken from the circuit system. Except for this, the closed loop characteristics can be made as similar as possible by increasing the gain in the position control block 201a.

  However, usually, a dynamic filter is inserted in the speed control block 201b, and when the speed control block 201b is eliminated, only a static gain is obtained. As a result, the dynamic characteristics are not changed. If it is desired to make the dynamic characteristics the same, it is possible to use the configuration shown in FIG. 10 or FIG.

  FIG. 10 shows an example of switching to a speed control block previously arranged in parallel on the cell of the FPGA 56 when there is a margin in the capacity of the FPGA 56.

  In the example of FIG. 10, when two identical components are arranged and an abnormality occurs using the switch SW (switch unit 210a, switch unit 210b, switch unit 210c, switch unit 210d, switch unit 210e, and switch unit 210f). Is configured to switch the switch SW according to the TRG generated by the abnormality determination unit.

  In the example of FIG. 11, two EEPROMs 59 in which a configuration program for the FPGA 56 is stored in advance are prepared, and a configuration example corresponding to a case where an error occurs in a part of the FPGA 56 is shown.

  In the configuration of FIG. 11, a signal is output from the FPGA 56 to the selection determination unit 220 via the error status line, and the FPGA code is reconfigured. Even the program data of the first EEPROM 59 is configured so that either the separately prepared program data of the second EEPROM 59 (program data set to cope with an abnormality) is reset in the FPGA 56.

  In addition, when an abnormality occurs despite the configuration performed several times by the program data of the first EEPROM 59, the second data storing the program data set to cope with the abnormality in the selection determination unit 220 is stored. An FPGA configuration sequence in which configuration is performed by the EEPROM 59 may be used. This can be realized by preparing an abnormality occurrence counter in the selection determination unit 220 in advance and switching the switch SW 221 when, for example, an abnormality occurs three times.

  Next, as an example of a case where an abnormality has occurred in the F / B (feedback) system, a coping example in which an error of the encoder 30a has occurred will be described using FIG.

  During normal operation, F / B data uses information from the encoder 30a. Here, when a malfunction occurs in the encoder 30a, the data path of the switching SW 222 is switched, and the position control F / B is performed using the data of the potentiometer 35. Normally, the potentiometer 35 is inferior to the encoder 30a in terms of data reliability (linearity, noise, etc.), so it is used only at the time of calibration necessary to detect the absolute position. You may comprise.

  Next, a case where an error occurs in the potentiometer 35 when the F / B system is abnormal will be described. When an abnormality occurs in the potentiometer 35, a balance with the calibration sequence occurs. The potentiometer 35 is the only absolute position detection means. When the clutch mechanism 36 is in the clutch OFF state, there is a possibility that a deviation occurs between the endoscope bending position and the remote control operation unit 7 position. Therefore, when a clutch OFF command is issued to the clutch mechanism 36, the actual clutch OFF operation is not performed, or a message to turn off the power is displayed on the monitor 6 when the clutch OFF operation is performed. . Further, since there is a maximum movable range limiting mechanical stopper (not shown) on the endoscope 2 side, it is operated as a relative position control operation so that it can be operated even when the position of the joystick and the bending position of the remote control operation unit 7 are shifted. Needless to say.

  FIG. 13 shows a basic logical configuration block 250 for detecting block abnormality and status in this embodiment. Further, the configuration of FIG. 14 shows a configuration (configuration used for processing of a normal CPU or the like) in which any one of the abnormalities is detected and reset by WDT-CR.

  As shown in FIG. 16, with the basic logical configuration block 250 of FIG. 13 as one unit, a desired abnormality processing detection unit 251 is formed by a combination of logical product and logical sum by combining any number of these basic logical configuration blocks 250 as shown in FIG. It becomes possible.

  That is, as shown in FIG. 13, the basic logic configuration block 250 includes a NAND part, a NOR part, and a switching part, and thus can constitute the basic logic of a Boolean algebra element. By stacking the basic logical configuration blocks 250, various logical expressions can be configured.

  Although it is difficult to realize with a CPU that executes a conventionally determined sequence, since the important configuration requirement of this embodiment is the FPGA 56, it can be easily realized because placement and wiring can be performed like an electric circuit. be able to.

  The input is composed of a switching setting signal, input 1 and input 2, and the output is composed of one output. According to this configuration, a more basic basic logical configuration block can be configured. For example, in the case of one input and one output, the input 1 may be connected like an electric circuit, and the switching setting signal may be fixed in order to use either AND or OR logic.

  FIG. 17 shows an application example of the abnormality processing detection unit 251 that combines the basic logic configuration blocks 250 (1) to (n). By configuring the determination unit for each block monitoring signal in the FPGA 56 as follows, when there is an abnormality in the F / B system (when an error occurs in the potentiometer 35 or the encoder 30a), switching to a normal position detecting means is performed. Is also possible.

  For example, normally, the electric bending control is performed by position control for controlling the position of the bending with respect to the position of the tilt angle of the joystick of the remote control operation unit 7, but according to the occurrence of an abnormality in the position control block 201a, It is also possible to eliminate the position control loop and execute the servo control in the speed control loop. In other words, it is possible to execute an operation for controlling the bending operation speed in accordance with the tilt angle of the joystick. Although details are not shown, the action determined from each condition can be realized by operating switching of wirings arranged in the FPGA 56 in advance.

  The switching state at the time of abnormality has been described so far, but FIG. 15 shows a determination configuration example in which the abnormality detection level is switched by combining this logical configuration block 250. As described above, the switching setting signal is fixed for each block abnormality and state detection. However, the switching setting signal of the first module (error level change determination logic module) is changed to another second module (abnormality). The error level can be arbitrarily switched by connecting to the output from the state occurrence determination logic module.

  The operation of this embodiment configured as described above will be described. In this embodiment, as shown in FIG. 18, when the power is turned on, initial mode processing is first executed. Then, after the initial mode process, the mode shift process is performed.

  In this mode switching process, for example, at the time of the clutch disengagement or when the bending operation start command is OFF at the end of the initial mode process, the mode is shifted to the calibration mode, the clutch is reconnected and the operation command value matches the scope position, or the bending is performed. When the operation start command is turned ON, the process returns to the mode switching process.

  Further, in the mode switching process, when the operation mode is selected, the operation mode is set and the servo is turned on, and when the end of the operation mode is instructed, the mode switching process is returned.

  Here, the operation mode is a mode in which an electric bending operation is performed based on an operation command from the remote controller operation unit 7, and the maintenance mode is a dedicated jig or a personal computer (to be described later) for parameter setting (reading and writing), status monitoring, and the like. This is a mode for performing remote operation or the like in the HMI mode connected to the.

  Further, in the mode switching process, when the maintenance mode is selected, the maintenance mode is set, the servo is turned on, and when the end of the maintenance mode is instructed, the mode switching process is returned.

  In the mode switching process, when a stop factor occurs, an abnormal stop mode is entered and the servo is turned off.

  The above content will be described in detail with reference to the flowchart of FIG. When the power is turned on, the FPGA 56 is configured by the EEPROM controller 102 in step S1. Subsequently, an initial mode process (described later) is executed in step S2, and the end of the initial mode process is awaited in step S3.

  When the initial mode process ends, a calibration request is generated from the operation mode controller 105 in step S4. In step S5, it is determined whether a maintenance mode processing request has been issued from the operation mode controller 105. If a maintenance mode process request is generated, a maintenance mode process (described later) is executed in step S6, and the process returns to step S5.

  If there is no maintenance mode processing request, it is determined in step S7 whether or not the operation mode controller 105 has returned from the maintenance mode processing to the mode switching processing. When returning to the mode switching process, a calibration request is generated from the operation mode controller 105 in step S8, and the process returns to step S5.

  If the mode switching process has not been restored, the operation mode controller 105 determines in step S9 whether the calibration request is valid. If the calibration request is valid, the operation mode controller 105 performs calibration in step S10. In step S11, it is determined whether the calibration process has been completed normally. If the calibration process has not ended normally, the process returns to step S5. If the calibration process has ended normally, the calibration request is canceled in step S12, and the process returns to step S5.

  If it is determined in step S9 that the calibration request is not valid, in step S13, the operation mode controller 105 determines whether or not the bending operation start command is turned off. If it is determined that the bending operation start command has been turned OFF, a calibration request is generated from the operation mode controller 105 in step S14, and the process returns to step S5.

  If it is determined that the bending operation start command is not OFF, the operation mode controller 105 determines whether or not the clutch connection is OFF in step S15. If the clutch connection is OFF, the process proceeds to step S14. If the clutch connection is ON, an operation mode process (described later) is executed in step S16, and the process returns to step S5.

  Next, the initial mode process will be described with reference to the flowchart of FIG. In step S21, the WDT 57 starts first. In step S22, each logic block initializes internal variables, and in step S23, the RL (left and right) motor current F / B unit 112, the UD (up and down) motor current F / B unit 113, and the potentiometer control unit 114. The thermistor control unit 115 starts sampling data.

  In step S24, communication is started by the serial communication unit 100 and the serial communication control unit 101. In step S25, it is determined whether or not the external hardware is normal. If abnormal, abnormal stop mode processing is performed in step S26. Execute.

  If it is determined that the external hardware is normal, the motor controller 110 determines whether the motor current offset is normal in step S27. If the motor current offset is abnormal, the abnormal stop mode process is executed in step S26. .

  If it is determined that the motor current offset is normal, the motor controller 110 detects the rotor position of the motor 30 in step S28, and reads the parameters in the DPRAM 106 in step S29.

  Next, the motor controller 110 determines whether or not the parameter values read in step S30 are all “0”. If the parameter values are all “0”, the process is terminated, and the parameter values are all “ In the case of “0”, the motor controller 110 writes the default value of the parameter in the DPRAM 106 in step S31 and ends the process.

  Next, the maintenance mode process will be described with reference to the flowchart of FIG. Updating of the operation mode controller 105 and jig (not shown) is started, and in step S41, the operation mode controller 105 determines whether a servo ON request is generated from the jig, and if there is a servo ON request in step S42. The servo is turned on and the process returns to step S41.

  Similarly, in step S41, the operation mode controller 105 determines whether a servo OFF request has been generated from the jig. If there is a servo OFF request in step S44, the servo is turned off and the process returns to step S41.

  Next, in step S45, the operation mode controller 105 determines whether an HMI mode (servo state monitor monitoring mode) request is generated from the jig. If there is an HMI mode request in step S46, the HMI mode processing is executed. The process returns to step S41.

  In step S47, the operation mode controller 105 determines whether or not a first maintenance request is generated from the jig. If there is a first maintenance request in step S48, the sine wave output mode process is executed and the process returns to step S41. .

  Subsequently, in step S49, the operation mode controller 105 determines whether or not a second maintenance request is generated from the jig. If there is a second maintenance request in step S50, the torque control mode process is executed and the process returns to step S41. .

  In step S51, the operation mode controller 105 determines whether a third maintenance request has been generated from the jig. If there is a third maintenance request in step S52, the operation mode controller 105 executes speed control mode processing and returns to step S41.

  In step S53, the operation mode controller 105 determines whether or not a fourth maintenance request has been generated from the jig. If there is a fourth maintenance request in step S54, the position control mode process is executed, and the process returns to step S41.

  Next, in step S55, the operation mode controller 105 determines whether or not a fifth maintenance request has been generated from the jig. If there is a fifth maintenance request in step S56, an analog input position control mode process is executed and step S41 is executed. Return to.

  In step S57, the operation mode controller 105 determines whether or not a sixth maintenance request has been generated from the jig. If there is a sixth maintenance request in step S58, the scope limit adjustment mode process is executed and the process returns to step S41. .

  Subsequently, in step S59, the operation mode controller 105 determines whether or not a seventh maintenance request is generated from the jig. If there is a seventh maintenance request in step S60, the lap operation mode process is executed and the process returns to step S41. .

  Here, the lap operation mode is a mode in which a predetermined bending operation, for example, a sequential operation such as RL-> UD-> RL is performed.

  Next, in step S61, the operation mode controller 105 determines whether or not an eighth maintenance request is generated from the jig. If there is an eighth maintenance request in step S62, the calibration adjustment mode process is executed and the process proceeds to step S41. Return.

  As described above, independent operation confirmation can be performed for each function necessary for the electric bending operation.

  Next, calibration mode processing will be described with reference to the flowchart of FIG. In step S81, the operation mode controller 105 determines whether the clutch connection is OFF. If the clutch connection is OFF, the servo is turned OFF in step S82 and the process proceeds to step S83. Proceed to

  In step S83, the operation mode controller 105 determines whether or not the clutch connection is ON. If the clutch connection is ON, the process proceeds to step S84. If the clutch connection is not ON, the process returns to step S81.

  In step S84, it is determined whether the operation amount and the current position are within a predetermined range. If they are within the predetermined range, the process proceeds to step S85, and if not within the predetermined range, the process returns to step S81.

  In step S85, it is determined whether or not the bending operation start command is ON. If the bending operation start command is ON, the process is terminated. If the bending operation start command is not ON, the process returns to step S81.

  Next, the operation mode process will be described with reference to the flowchart of FIG. 23 and with reference to the timing chart of FIG. First, in step S71, the servo is turned on. In step S72, it is determined whether the torque control cycle event period is reached. If it is a torque control cycle event, torque control calculation processing is executed in step S73, and the process returns to step S72. If so, the process proceeds to step S74.

  In step S74, it is determined whether or not it is a position / speed control event period. If it is a position / speed control event, the position / speed control calculation process is executed in step S75, and the process returns to step S72. The process proceeds to step S76. Then, it is determined whether or not a servo abnormality is detected in step S76. If a servo abnormality is detected, an abnormal stop mode process is executed in step S77. If a servo abnormality is not detected, the process returns to step S72.

  As described above, in this embodiment, the processing is divided into logic blocks by the FPGA and the electric bending control is performed. Therefore, unlike the conventional sequential control using the microprocessor, some servo systems are abnormal. Even if this occurs, the entire control system does not stop, and the servo system can be effectively selected. Therefore, the operability can be improved without interrupting the inspection.

  Although the control unit 37 is provided in the bending control unit 10b of the endoscope 2, the present invention is not limited thereto, and the control unit 37 may be provided in the image processing device 4 or provided in a separate controller device. May be.

  The present invention is not limited to the above-described embodiments, and various changes and modifications can be made without departing from the scope of the present invention.

1 is a configuration diagram showing a configuration of an electric bending endoscope apparatus according to Embodiment 1 of the present invention. The figure which shows the structure of the front panel of the image processing apparatus of FIG. The figure which shows the structure of the curvature control part of FIG. The figure which shows the structure of the control part of the curvature control part of FIG. The figure which shows the structure of the logic block of FPGA of FIG. The figure which shows the structure of the control processing part of the motor controller of FIG. The figure which shows the structure of the servo abnormality detection part of the motor controller of FIG. 1st explanatory drawing explaining the servo control in the motor controller of FIG. 2nd explanatory drawing explaining the servo control in the motor controller of FIG. Explanatory drawing explaining the 1st modification of the servo control in the motor controller of FIG. Explanatory drawing explaining the modification of the configuration of FPGA of FIG. Explanatory drawing explaining the 2nd modification of the servo control in the motor controller of FIG. 1 is an explanatory diagram for explaining logical element blocks constituting the FPGA block abnormality monitoring unit of FIG. 2nd explanatory drawing explaining the logical element block which comprises the FPGA block abnormality monitoring part of FIG. FIG. 13 is a first explanatory diagram illustrating a logic determination block using the logic element block of FIG. 2nd explanatory drawing explaining the logic determination block using the logic element block of FIG. FIG. 13 is a third explanatory diagram illustrating a logical determination block using the logical element block of FIG. The figure explaining the process transition in FPGA of FIG. Flowchart for explaining processing in the FPGA of FIG. Flowchart for explaining the initial mode process of FIG. Flowchart for explaining the maintenance mode process of FIG. Flowchart for explaining the calibration mode processing of FIG. Flowchart for explaining the operation mode processing of FIG. FIG. 19 is a timing chart for explaining the operation mode processing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electric bending endoscope apparatus 2 ... Endoscope 3 ... Light source apparatus 4 ... Image processing apparatus 7 ... Remote control operation part 10 ... Base end holding part 10b ... Bending control part 30 ... Bending motor 30a ... Encoder 31, 32 ... Gear 33 ... Bending wire 34 ... Sprocket part 35 ... Potentiometer 36 ... Clutch mechanism part 56 ... FPGA
DESCRIPTION OF SYMBOLS 100 ... Serial communication unit 101 ... Serial communication control part 102 ... EEPROM controller 103 ... Abnormal signal processing part 104 ... LED controller 105 ... Operation mode controller 106 ... DPRAM
107 ... Clutch signal input unit 108 ... Jig substrate input / output unit 109 ... RAM
DESCRIPTION OF SYMBOLS 110 ... Motor controller 111 ... Motor drive waveform generation part 112 ... RL (left / right) motor control part 113 ... UD (up / down) motor control part 114 ... Potentiometer control part 115 ... Thermistor control part 116 ... RL encoder control part 117 ... UD encoder control 118: FPGA block abnormality monitoring unit

Claims (8)

A bending portion provided in the insertion portion;
A bending drive means having a plurality of constituent members for bending the bending portion;
Bending power means for driving the bending drive means;
Bending state detection means for detecting operation information of the bending drive means and detecting bending state information of the bending portion;
Instruction means for outputting bending instruction information for bending the bending portion;
A bending motion control means configured to include a plurality of independent logic blocks for controlling the bending instruction information of the instruction means and the bending state information of the bending portion to coincide with each other. Endoscope. The logical block is:
A bending state information input logic block for acquiring the bending state information detected by the bending state detection means;
The electric bending endoscope according to claim 1, further comprising: a state calculation logic block that calculates the bending state information acquired by the bending state information input logic block and the bending instruction information. The electric bending endoscope according to claim 1, further comprising a block monitoring unit that monitors a control state of the logic block constituting the bending operation control unit. The electric bending endoscope according to claim 3, further comprising: a logic block selecting unit that selects the logic block constituting the bending operation control unit based on a monitoring result of the block monitoring unit. The electric bending endoscope according to claim 4, wherein the block monitoring unit and the logical block selection unit are further configured by the logical block. The bending state information includes bending position information of the bending portion,
The state operation logic block is:
A position information calculation logic block for calculating a difference between the bending position information and the bending instruction information and calculating position deviation information;
A speed information calculation logic block for calculating a temporal change rate of the bending position information;
The electric bending endoscope according to claim 1, further comprising: a position information calculation logic block that calculates position information of the bending portion. The electric bending endoscope according to claim 1, wherein the logic block includes a plurality of logic blocks having functions capable of reconfiguring logic. The electric bending endoscope according to claim 7, wherein the bending operation control unit includes an FPGA.

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